Hewlett-Packard HP 25 (Woodstock SQUASH)

Hewlett-Packard HP 25
Image: Wikimedia CC BY-SA 3.0
The Hewlett-Packard HP 25 is a programmable calculator with 12 digits precision and RPN (reverse polish notation) logic. It has 68 functions, 30 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 2xAA.

Facts at a glance:

Feature Value
Type: Programmable
Functions: 68
Keys: 30
Precision: 12
Logic: RPN
Display type: LED
Length: 129mm
Width: 67mm
Thickness: 29mm
Weight: 170g
Power Source: 2xAA
Year introduced: 1975
YearDiscontinued: 1978

See other calculators by Hewlett-Packard